Young (Kim Min-Hee) and Dong-Hee (Lee Min-Ki) work at the same bank. They secretly dated for the past 3 years, but recently decided to end their relationship. Both tell the other that they are fine and moved on, but inside their hearts they are not and continue to have feelings for one another. Young's co-worker Son (Ra Mi-Ran) then tells her that she will introduce her to nice guy at dinner later that evening and she brings him to a bank worker's dinner get-together. Dong-Hee is also there and bristles with jealousy, so he begins to talk negatively about Young in front of her and the man she just met. Young becomes furious at Dong-Hee and pours beer all over him. A loud confrontation erupts between the former lovers and everybody at the bank is now aware that the two secretly dated. 

 Their bitter breakup turns worse when each continue to bicker and battle. Dong-Hee demands his laptop back and Young mails it back to him in several shattered pieces. Dong-Hee responds by mailing back her belongings, including foul smelling food that is now rotten. Adding fuel to the fire, Young logs into his Facebook account and discovers that he is already dating another girl. How will this love/hate relationship end?